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From e563e6a7c55e65c554e07db6215f8bcb2d411d3b Mon Sep 17 00:00:00 2001
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From: Vishal Verma <vishal.l.verma@intel.com>
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Date: Tue, 30 Mar 2021 20:50:37 -0600
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Subject: [PATCH 015/217] libdaxctl: add an API to check if a device is active
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Add an API to check whether a daxctl device is active in system-ram
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mode. This would be used from libndctl during
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ndctl_namespace_disable_safe(), so that we don't disable/destroy an
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underlying namespace while the memory is active and online.
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Reported-by: Chunye Xu <chunye.xu@intel.com>
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Cc: Dan Williams <dan.j.williams@intel.com>
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Cc: Dave Hansen <dave.hansen@linux.intel.com>
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Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
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---
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daxctl/lib/libdaxctl.c | 10 ++++++++++
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daxctl/lib/libdaxctl.sym | 1 +
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daxctl/libdaxctl.h | 1 +
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3 files changed, 12 insertions(+)
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diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c
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index 879f7e6..860bd9c 100644
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--- a/daxctl/lib/libdaxctl.c
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+++ b/daxctl/lib/libdaxctl.c
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@@ -1665,3 +1665,13 @@ DAXCTL_EXPORT int daxctl_dev_will_auto_online_memory(struct daxctl_dev *dev)
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/* match both "online" and "online_movable" */
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return !strncmp(buf, "online", 6);
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}
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+
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+DAXCTL_EXPORT int daxctl_dev_has_online_memory(struct daxctl_dev *dev)
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+{
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+ struct daxctl_memory *mem = daxctl_dev_get_memory(dev);
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+
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+ if (mem)
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+ return daxctl_memory_is_online(mem);
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+ else
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+ return 0;
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+}
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diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym
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index 892e393..a13e93d 100644
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--- a/daxctl/lib/libdaxctl.sym
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+++ b/daxctl/lib/libdaxctl.sym
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@@ -95,4 +95,5 @@ global:
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LIBDAXCTL_9 {
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global:
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daxctl_dev_will_auto_online_memory;
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+ daxctl_dev_has_online_memory;
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} LIBDAXCTL_8;
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diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h
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index 30ab51a..683ae9c 100644
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--- a/daxctl/libdaxctl.h
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+++ b/daxctl/libdaxctl.h
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@@ -72,6 +72,7 @@ int daxctl_dev_enable_devdax(struct daxctl_dev *dev);
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int daxctl_dev_enable_ram(struct daxctl_dev *dev);
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int daxctl_dev_get_target_node(struct daxctl_dev *dev);
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int daxctl_dev_will_auto_online_memory(struct daxctl_dev *dev);
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+int daxctl_dev_has_online_memory(struct daxctl_dev *dev);
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struct daxctl_memory;
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struct daxctl_memory *daxctl_dev_get_memory(struct daxctl_dev *dev);
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--
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2.27.0
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